Here's my codes for Sydney, was hoping they'd have their codes for Australia day up. Never mind just checked Gav's post above there's a few there good on Australia day.
Offers Available at Domino's GLEBE Only
Domino's Pizza

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Offer terms & conditions
*$2 surcharge applies for each additional topping, half 'n' half pizzas. $2.95 surcharge applies for "Cheesy Crust", "The Edge","Gluten Free" Pizzas. No half 'n' half allowed on the Value Range or Chef's Best Pizzas. No substitute toppings allowed on Value Range. Chicken and Prawn Pizzas, and 97% Fat Free Pizzas $2.95 more than Traditional Range. Minimum delivery order $24. Drivers only carry $20 in change. 10% surcharge will apply on public holidays in Canberra, Brisbane, Gold Coast & surrounding areas. All offers not valid with any other coupon or offer. Only available at selected stores. Prices include GST. DOMINO'S, the Tile Device, the slogan IT'S ALL GOOD are trade marks or registered trade marks of Domino's IP Holder LLC in Australia.